package com.demo.etl;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
public class WebLogDriver {public static void main(String[] args) throws Exception {

// 输入输出路径需要根据自己电脑上实际的输入输出路径设置
    args = new String[] { "D:\\Code\\JavaCode\\MapReduceDemo\\test_data\\in\\ETL", "D:\\Code\\JavaCode\\MapReduceDemo\\test_data\\out\\ETL" };

    // 1 获取job信息
    Configuration conf = new Configuration();
    Job job = Job.getInstance(conf);

    // 2 加载jar包
    job.setJarByClass(WebLogDriver.class);

    // 3 关联map
    job.setMapperClass(WebLogMapper.class);

    // 4 设置最终输出类型
    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(NullWritable.class);

    // 设置reducetask个数为0
    job.setNumReduceTasks(0);

    // 5 设置输入和输出路径
    FileInputFormat.setInputPaths(job, new Path(args[0]));
    FileOutputFormat.setOutputPath(job, new Path(args[1]));

    // 6 提交
    boolean b = job.waitForCompletion(true);
    System.exit(b ? 0 : 1);
}
}
